Merge pull request #153 from swcarpentry/update/packages · swcarpentry/r-novice-gapminder-es@0e4ee12

[image missing alt-text]: fig/bad_layout.png

[image missing alt-text]: fig/13-dplyr-fig1.png

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[image missing alt-text]: fig/13-dplyr-fig3.png

[image missing alt-text]: fig/14-tidyr-fig1.png

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[image missing alt-text]: fig/New_R_Markdown.png

[missing anchor]: [argumento](#argumento)

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